/**
  
 A program to print algebraic expressions

*/


public class Algebra

{
   
    public static void main(String[] args)
   
     {

      
     /*  Your work here  */
      System.out.println(" Given: f(x) = 3x - 15");
      System.out.println(" Let x = 4");
      System.out.println(" Then");
      System.out.println("   f(4) = 3x4 - 15");
      System.out.println("        = 12 - 15");
      System.out.println("        = -3");

   
}

}